A radioactive sample studied in a lab is found to have a half-life of 25 hours. If the initial sample contained 7.5x10¹⁰ radioactive nuclides estimate the number of radioactive nuclides present in the sample after 10 hours.

Q: Suppose that you start with 3.65 g of a pure radioactive substance and determine 19.6 h later that…

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Q: Radon-222 decays at a continuous rate of 17.3% per day. Suppose a scientist begins with a sample of…

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Q: After 1.82 days, the activity of a sample of an unknown type radioactive material has decreased to…

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Q: How many half-lives would have to elapse for a sample of a radioactive isotope to decrease from an…

A: No = 192 cpmN = 3 cpm

Q: Your company develops radioactive isotopes for medical applications. In your work there, you measure…

A: We know,  the activity equation is given by A=A0e-λt From the table it is seen that A0=20,000 At…

Q: The radioactive isotope (95 Nb) has a half-life of 35 days. A sample containing this isotope has an…

A: Let the half -life of the isotope be denoted as t1/2 .The expression for the decay constant λ in…

Q: A radioactive sample’s half-life is 1.0 min, so each nucleus in the sample has a 50% chance of…

A: Given A radioactive sample’s half-life is 1.0 min, then each nucleus in the sample has a 50% chance…

Q: A sample of the radioactive nuclide 199Pt is prepared that has an initial activity of 7.80×1011 Bq…

A: a) We know ,   half life t12=t ln2ln NoNtinitial activity = 7.8x1011next activity = 9.45x1010

Q: A pure sample of 226 Ra contains 2.0 x 10^14 atoms of the isotope. If the half life of. 226 Ra = 1.6…

A: Given that, No. of atoms of a pure sample of 226 Ra is 2.0 x 1014 atoms. The half-life of the sample…

Q: 4⁰K is an unusual isotope, in that it decays by negative beta emission, positive beta emission, and…

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Q: The half-life of iodine-131 (131I)(131I), an isotope used in the treatment of thyroid disorders, is…

A: Write the relation between decay constant to the half life.

Q: What nuclide is produced in the following radioactive decays? (a) a decay of 239 94 Pu; (b) b- decay…

A: Part(a): The Alpha decay means the extraction of 2He4 nucleus from a radioactive atom. The alpha…

Q: When 2041Ca ( Atomic Mass , 40.962278 u ) decays by electron capture, the disintegration energy is…

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Q: (a) The diagram shows the decay curve for a radioactive isotope that emits only B-particles. 400…

A: Hello. Since your question has multiple parts, we will solve the first part for you. If you want any…

Q: After 2.00 days, the activity of a sample of an unknown type radioactive material has decreased to…

A: Formula to calculate the activity

Q: The half-life for the a decay of uranium 2U is 4.47 x 10° yr. Determine the age (in years) of a rock…

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Q: Question 1. Tritium has a a tritium sample will remain (a) after 5.00 yr?

A: GivenHalf Life for Tritium, t1/2=12.33 years

Q: A sample of radioactive material has a half-life of 12 hours. If the initial sample contained…

A: Not all combination of neutrons and protons inside a nucleus is stable. When there is a mismatch…

Q: The half-life of a radioactive nuclide is 20 years. If a sample of this nuclide has an activity of…

A: Formula of radioactivity is as follows: I=I0e-λt…

Q: The half-life of radon-222 is about 3.823 days. (a) Determine the decay constant for radon-222.…

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Q: The figure shows a typical radioactive decay (amount of undecayed nucleus (N) vs. time (t)) from a…

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Q: The activity of a particular radioactive nuclide falls from 1 × 1011 Bq to 2 × 1010 Bq in 10 hours.…

A: Given, The activity of a particular radioactive nuclide falls from 1 × 1011 Bq to 2 × 1010 Bq in 10…

Q: The amount of radioactive 40K in a 70kg person is approximately 5000Bq. A) what is the number (N) of…

A: mass of person (m) = 70 kg Activity (A)  = 5000 Bq Half life of K40 = 1.25×109 years